2hp Reverb (2014–2023)
Two HP of digital shimmer that fits in the crack between your oscillators - and somehow still sounds like a real space.
Overview
The 2hp Reverb takes up less space than a patch cable is long, and it still gives a wide, believable sense of space. It doesn't try to be everything. There are no endless presets, no granular washes, no glitchy stutters. The reverb tail blooms naturally, from tight room reflections to cathedral-sized decays. It won't fool anyone into thinking they're in Vienna's Musikverein. It lands somewhere honest: a padded studio, a tiled stairwell, a half-empty church on a Tuesday afternoon.
The module is built around the FV-1 digital signal processor, a chip that became a cult favorite in compact effects for its low power draw and manageable footprint. The Reverb has stereo in and out, two knobs and a single CV input. There's no menu diving, no hidden functions and no firmware updates. Turn the Time knob and the space expands. Turn Dampening and the high-end fizz softens into warmth, like lowering a scrim across a bright window. The CV control is dedicated solely to mix, so you can automate the blend from bone-dry to drenched without touching the knob. It's not the most flexible modulation setup, but it works. Pair it with an envelope follower and your drums breathe, or use an LFO to gently pulse a pad in and out of a fog.
Yes, it's digital, but it isn't harsh and aliased like some early DSP reverbs. The 2hp unit avoids the worst of the metallic artifacts. Push it too hard and it shows, though. At maximum decay with bright sources there's a slight ringing in the upper mids, a glassy resonance that tells you this isn't a Lexicon 480L. In a modular context, where you're often layering textures and need something to glue them together, that can work in its favor. It sits in the mix like a textured backdrop, not a polished illusion.
Specifications
| Manufacturer | 2hp |
| Production Years | 2014–2023 |
| Original Price | $169 |
| Form Factor | Eurorack |
| HP | 2 |
| Depth | 35mm |
| Current Draw +12V | 60mA |
| Current Draw -12V | 20mA |
| Inputs | Stereo audio in (3.5mm jacks) |
| Outputs | Stereo audio out (3.5mm jacks) |
| CV Inputs | 1 (Mix control) |
| Controls | Time, Dampening, Mix (knob and CV attenuverter) |
| Signal Processing | Digital (FV-1 DSP chip) |
| Reverb Types | Algorithmic stereo reverb |
| Reverb Time Range | 0.1 to 10 seconds |
| Dampening Control | Adjusts high-frequency content of reverb tail |
| Mix Control | Dry/wet blend via knob and CV input |
| Weight | 100g |
Key Features
The FV-1 Advantage: Tiny Brain, Big Sound
The 2hp Reverb uses the Spin Semiconductor FV-1, a DSP chip designed specifically for compact audio effects with minimal host processing. Unlike full-blown microprocessors, the FV-1 runs preloaded algorithms stored in external ROM, which keeps the design simple and the power draw low. For 2hp, this meant they could build a stereo reverb in 2HP without a heat sink, external power tap, or complex firmware. The trade-off is limited real-time control. You can't switch algorithms or tweak internal parameters via CV. The reverb character is fixed, shaped only by Time, Dampening, and Mix. Within those limits the algorithm is well-tuned. It avoids the "hall of mirrors" effect that plagues some minimalist digital reverbs and gives a smooth decay that feels organic, even when pushed.
Stereo In, Stereo Out—Without the Bloat
In a format where every millimeter counts, making the Reverb fully stereo was a bold call. Most 2-3HP effects either sum to mono or offer stereo outs with a shared input. The 2hp unit gives you discrete left and right inputs and outputs, preserving spatial information from stereo sources like dual delays or stereo oscillators. That makes it especially useful at the end of a stereo effects chain, say after a stereo delay or chorus, where maintaining width matters. It isn't a dual mono reverb, so it doesn't process each channel independently. The stereo image is preserved through the algorithm, which gives one cohesive field rather than two parallel reverb tails.
CV Over Mix: Subtlety Over Spectacle
The single CV input is dedicated to mix control. That might seem limiting compared to modules offering CV over decay or damping, but it's one of the most musically useful parameters to modulate. Automating the dry/wet blend lets you create dynamic swells, duck reverb during rhythmic passages, or fade a sound into oblivion with an envelope. The attenuverter on the CV input sets modulation depth, so you can go from barely-there modulation to full wet/dry sweeps. No patching is required to get expressive movement.
Historical Context
The 2hp Reverb launched in 2014, when Eurorack was in the middle of a space race - not for bigger systems, but for smaller modules. The format's popularity was exploding, and cases were filling up fast. Builders like 2hp, Doepfer, and Intellijel were pushing to make essential functions fit into shrinking footprints. Most modular users still relied on external pedals for effects, and putting reverb inside the rack meant dealing with level matching, impedance issues, and precious HP. The 2hp unit solved part of that. It ran at Eurorack levels, had stereo I/O, and took up barely any space. It wasn't the first compact reverb - Erica's Pico DSP and Industrial Music's RT-60 predated it - but it was among the first to balance size, sound quality, and price in a way that felt like a real alternative to pedals.
It also reflected a broader shift in how modular was being used. Eurorack was no longer just a tool for academic sound design or sequenced repetition. It was becoming a complete performance and production environment. Having reverb in the rack meant you could patch it into feedback loops, modulate it with random sources, or use it as a texture generator. The 2hp Reverb wasn't designed for extreme mangling. It won't self-oscillate or create infinite tails. It was reliable enough to be a workhorse, and small enough to justify its place even in tightly packed systems.
Collectibility & Value
The 2hp Reverb was discontinued in 2023. It's not yet a "holy grail" item, but it's getting harder to find in clean, fully functional condition. Original retail was $169, and used prices now range from $180 to $250 depending on color (black, silver, or limited editions) and seller. There are no known chronic hardware failures. The FV-1 is solid-state and the build quality is consistent. Owners do report occasional issues with jack solder joints, especially if the module has been frequently patched. The 3.5mm jacks are standard Eurorack size, but they're close together, so using wider cables can stress the board over time.
When buying, check that the CV input responds smoothly across its range and that there's no crackling in the audio path when turning the knobs. Some users have noted slight channel imbalance in stereo output, usually due to pot wear, but this is rare. Because the module is DSP-based, there are no aging capacitors or analog drift to worry about, just clean digital operation as long as the chip and power regulation hold up.
It's not the last word in reverb quality. Anyone with a Strymon BigSky or Eventide H9 will hear the difference. For a system where every HP counts, the 2hp Reverb is a "good enough" solution that doesn't require leaving the rack.
Market Value
┌──────────────────────────────────────────────────────────────────────────┐ │ 2HP REVERB Aug 2026 │ ├──────────────────────────────────────────────────────────────────────────┤ │ High $379 Latest $140 │ │ Median $165 Trend — │ │ Low $60 Volume ~25/mo │ ├──────────────────────────────────────────────────────────────────────────┤ │ $400 ┤ │ │ │ .. │ │ │ │ │ $250 ┤ . │ │ │ .. . . . . . . ... │ │ │.... . . . . . . . . . . . . .. . . .. ... │ │ │ .. . . .. . . . ... .. . . .│ │ $50 ┤ . . . . . . . │ │ ├─────────────────────────────────────────────────────────────────│ │ vol │▄▃▃▁▁▃ ▄ ▆▄ ▃▁▃▆ ▁▁ ▃ ▁ ▁▁ ▁▁▁ ▁▃ ▁▁█ ▁▁ ▃▃ ▃▁▁▁▁▃▁▁▃ ▄▁▄▁│ │ └─────────────────────────────────────────────────────────────────│ │ 2026-04 2026-06 2026-07│ └──────────────────────────────────────────────────────────────────────────┘
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